Current state of my dtmail work.

Mostly #ifdefs and casts; also, do not redefine strcasestr().  This will
probably be needed for Linux too when compiling without -fpermissive.

cde/programs/dtmail/include/DtMail/Threads.hh

@@ -120,7 +120,7 @@ class Condition : public DtCPlusPlusAllocator {
 
     int state(void);
     int operator=(int);
-    operator += (int);
+    int operator += (int);
     operator int(void);
 
     void wait(void);